Surface sweeping machine with tilting blower housing
A road sweeper includes a blower housing having an opening, a hopper having an opening, and the openings being in axial alignment when the hopper and blower housing are each in a sweeping position thereof. The blower housing is biased for tilting movement from its sweeping position to an inclined dump position upon relative movement of the hopper to preclude abrasion, wear and damage to an O-ring seal disposed between the openings. The blower housing can also be moved to a third repair position in which components thereof are accessible from the cab side of the sweeper.
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The present invention is directed to a surface sweeping machine, commonly referred to as a road sweeper, which utilizes a conventional truck body including a cab and a frame with the latter having mounted thereon a pick-up head, a hopper, a centrifugal separator, a blower, a blower housing, and associated openings and conduits for circulating air entrained debris through the centrifugal separator and thereby depositing debris in the hopper for subsequent discharge/dumping.
A typical road sweeper of the latter construction is found in U.S. Pat. Nos. 3,512,206 and 3,545,181, each in the name of Bernard W. Young granted on May 19 and Dec. 8, 1970, respectively. Debris from the hopper is discharged through a hydraulically opened and closed rear door. Over the years road sweepers have evolved and the assignee (Tymco, Inc.) of the present invention developed, manufactured, sold and patented a surface sweeping machine with over-the-cab hopper dumping, as is evidenced by U.S. Pat. No. 5,072,048 in the name of Gary B. Young et al. granted on Dec. 17, 1991. The road sweeper of this patent includes a hopper having an opening which is in registration with an opening of a blower housing during a sweeping operation but for dumping purposes the hopper can be pivoted away from the blower housing, while the blower housing and its associated blower/turbine remains stationary with respect to the vehicle frame.
A road sweeper disclosed in U.S. Pat. No. 3,634,904 granted on Jan. 18, 1972 to Gregory J. Larson (assigned to Wayne Manufacturing Company) discloses a road sweeper in which flexible and rigid conduits are connected to each other between a debris hopper and a suction hood or pick-up head. The hopper carries a rigid conduit which in turn carries an O-ring seal which mates against a plenum face of a coupling connected to a flexible conduit. The coupling is supported by both a compression spring and a link to the vehicle frame. When the hopper is returned from an open dumping position to a working position, the rigid upper conduit section carried thereby swings downwardly to engage and compress the O-ring seal against the plenum face 29 and also compresses the spring supporting the flexible conduit coupling. In accordance with the latter disclosure, the pivoting motion of the debris hopper thereby connects and disconnects the hopper conduit relative to the pick-up head.
U.S. Pat. No. 5,596,788 granted on Jan. 28, 1997 to Ronny E. Linville et al. discloses a road sweeper in which a pivotally mounted hopper has a pair of openings which align with openings of an inlet conduit leading from a pick-up head and a fan inlet flange of a vacuum fan housing. Gaskets are utilized with the latter openings to prevent air leakage and sealing surfaces or flanges associated therewith are canted to slope rearwardly and downwardly to provide complementary mating engagement between the sealing surfaces of the movable hopper and an immovable lower housing carried by the vehicle frame.
BRIEF SUMMARY OF THE INVENTIONThe invention provides a novel road sweeper which includes a hopper pivoted between sweeping and dumping positions, a centrifugal separator associated therewith, a pick-up head, a blower housing, and associated conduits and openings creating a path of travel for air-entrained debris. In the sweeping position of the hopper and blower housing, openings thereof are in registry with each other and are sealed by an O-ring gasket or seal. However, during movement of the hopper from its sweeping position, the blower housing tilts away from the hopper virtually immediately upon hopper movement to prevent damage to the gasket or seal carried by the blower housing. The abrupt pivoting or tilting movement of the blower housing upon movement of the hopper is achieved by mounting the blower housing for pivotal movement about a pivot point which is appreciably radially beneath the hopper and blower housing openings in the sweeping/axially aligned positions thereof. As the hopper begins its upward dumping motion, preferably upward side dumping movement, through appropriate linkage mechanisms and hydraulic piston/cylinder mechanisms, the blower housing which is under constant compression spring bias is pivoted progressively during initial hopper movement toward its dumping position. As the hopper is returned by the linkage mechanism and the hydraulic mechanisms associated therewith from its dumping position to its sweeping position, an abutment plate of the hopper contacts a contact plate of the blower housing and pivots the blower housing against the biasing force of the compression springs to its sweeping position at which the blower housing and hopper openings are axially aligned. Therefore, during hopper movement in either of two directions between the hopper sweeping/home position and the hopper dumping position, the blower housing is tilted or pivoted to prevent the O-ring gasket or seal carried thereby from being damaged.
In further accordance with the present invention, a compression spring assembly is pivotally connected at opposite ends thereof to the blower housing and a portion of the vehicle frame to impart to the blower housing the biasing force heretofore mentioned to pivot the blower housing from its home/in-use sweeping position to its dumping position. However, the compression spring assembly also includes several unique structural features including variable points of pivotal connection to adjust the force of compression springs which might over long usage develop a “compression set” lower than the design parameters. By changing the point of connection between the compression spring assembly and the vehicle frame, the spring compression can be increased from an undesired lower compression set to that which is optimum.
A further feature of the compression spring assembly is the provision of a pivotal connection between the same and the frame of the road sweeper at which the blower housing can be pivoted in a direction opposite to its pivotal movement toward its dumping position, while the hopper is in its dumping position, to permit inspection, repair and/or replacement of the blower motor, fan and associated components from a forward side or cab side of the blower housing. In the latter “repair” position the blower housing need not be removed from the vehicle which is extremely desirable from the standpoint of convenience and efficiency of repair and the corresponding lessening of down-time associated therewith.
The blower housing is also pivotally secured to the vehicle frame by a pair of adjusting mechanisms which permit the blower housing opening to be accurately aligned with the hopper opening in the sweeping position. Each adjusting mechanism for adjusting the blower housing pivot includes a pair of plates which can be relatively adjusted vertically upwardly, downwardly, sideways and fore and aft to assure alignment of the axes of the blower housing and hopper openings which in turn assures an effective seal by the O-ring gasket disposed therebetween and accompanying efficient sweeping operations under minimal cost.
With the above and other objects in view that will hereinafter appear, the nature of the invention will be more clearly understood by reference to the following detailed description, the appended claims and the several views illustrated in the accompanying drawings.
A surface sweeping machine with a tilting or pivoting blower housing is illustrated in
A blower housing 30 occupies a similar first working or sweeping position (
A substantially annular hollow O-ring seal or gasket 40 (FIGS. 1 and 3-5) surrounds the opening 31 of the blower housing 30 and includes an annular sealing face or surface 41 and opposite thereto an annular radially outwardly directed securing flange 42 which defines a securing slot 43 with an inboard annular wall 44 of the O-ring seal 40. A plurality of radially inwardly directed brackets or a single annular radially inwardly directed bracket 45 is secured to a rear wall 39 of the blower housing 30 by bolts 49 threaded through openings (not shown) of the bracket 45 into threaded bores of bosses 69 projecting from the rear wall 39. The O-ring seal 40 is located in the slot 43 to retain the O-ring seal 40 assembled to the blower housing 30 for compressively seating against and sealing the sealing flange 27 (
A pair of identical mechanisms or means 50, 50 (
Each of the pivotal connecting means 50 includes a relatively rigid metal L-beam or L-support 51 defined by a vertical flange 52 (
An intermediate support member 70 of each of the pivotal mounting mechanism 50 includes a horizontal flange 71, a vertical flange 72 and a pair of spaced angular gussets 73, 73 (
The pillow block 80 is defined by a horizontal flange 81, a vertical flange 82 and spaced side gussets 83, 83 (
Each pivotal mounting mechanism 50 further includes a pair of spaced plates 101, 101 which are welded along horizontal and vertical edges thereof (unnumbered) and house therebetween the plates 83, 83 (
As is most readily apparent from
A means or mechanism 130 (
The compression spring assembly 130 further includes a pair of lower support plates 141, 141 disposed in spaced parallel relationship to each other which are welded to a lower portion (unnumbered) of the frame 13, as is most evident in
An upper carrier plate 160 and a lower carrier plate 170 have respective flanges 161, 161 and 171, 171, each including an opening 162, 172, respectively, through which pass pivot pins 163, 163 and a single pivot pin 173 (
Each compression spring 150 surrounds a cylindrical compression spring guide member 151 which at an upper end passes through an associated sleeve 152 welded to the carrier plate 160. A lower end of each spring 150 rests upon a collar 153 which also supports a lower end of the compressing spring guide member 151. A sound and vibration dampening mounting 154 includes a bolt 155 fixed to a sound and vibration dampening elastomeric collar 156 bolted to the lower carrier plate 170 and threadably connected to an internal threaded bore 157 of each guide member 151. As is most readily apparent from
The compression spring assembly 130 further includes means or a mechanism 180 for adjustably limiting the maximum tilting or pivoting movement of the blower housing 30 between the two extreme relative positions thereof, namely, the dumping position of
It is assumed that the sweeper 10 is operating in its working or sweeping mode or position which is that illustrated in
Referring specifically to
Reference is made to
Although a preferred embodiment of the invention has been specifically illustrated and described herein, it is to be understood that minor variations may be made in the apparatus without departing from the spirit and scope of the invention, as defined by the appended claims.
Claims
1. A sweeper comprising a vehicle, a blower housing and a hopper carried by said vehicle, means for supporting said hopper for movement between a first sweeping position and a second dumping position, means for supporting said blower housing for movement between a first sweeping position and a second dumping position, means for moving said hopper from the first position toward the second position thereof, means for moving said blower housing from the first position toward the second position thereof, an opening in said blower housing and an opening in said hopper through which media flows when said blower housing and hopper are each in the first position thereof, and means for increasing the distance between the blower housing and the hopper upon rotational movement of said blower housing about a substantially horizontal axis from the first position thereof toward the second position thereof thereby providing clearance for hopper movement from the first sweeping position to the second dumping position.
2. The sweeper as defined in claim 1 wherein said distance increasing means includes pivot means of said blower housing supporting means about which said blower housing pivots during movement thereof from said blower housing first position toward said blower housing second position.
3. The sweeper as defined in claim 1 wherein said blower housing moving means is defined by biasing means.
4. The sweeper as defined in claim 1 wherein said distance increasing means includes pivot means of said blower housing supporting means about which said blower housing pivots during movement thereof from said blower housing first position toward said blower housing second position, and said pivot means is located radially outboard of said openings in said first positions.
5. The sweeper as defined in claim 1 wherein said blower housing moving means is defined by mechanical spring means.
6. The sweeper as defined in claim 1 including means for sealing said openings relative to each other in said hopper and blower housing first sweeping positions.
7. The sweeper as defined in claim 1 wherein said openings each include an axis, and said axes are substantially coaxially aligned in said first sweeping positions.
8. The sweeper as defined in claim 1 wherein said openings each include an axis, said axes are substantially coaxially aligned in said first sweeping positions, and said axes include therebetween a substantially acute angle in said second positions.
9. The sweeper as defined in claim 1 including means carried by said blower housing for sealing said openings relative to each other in said hopper and blower housing first sweeping positions.
10. The sweeper as defined in claim 1 wherein said blower housing supporting means support said blower housing for movement between the first sweeping position thereof and a third position adapted for servicing blower components carried by said blower housing.
11. The sweeper as defined in claim 1 wherein said blower housing supporting means support said blower housing for movement between the first sweeping position thereof and a third position adapted for servicing blower components carried by said blower housing, and the blower housing first sweeping position is located between the second dumping and third servicing positions thereof.
12. The sweeper as defined in claim 1 wherein said blower housing supporting means support said blower housing for movement between the first sweeping position thereof and a third position adapted for servicing blower components carried by said blower housing, said blower housing opening and hopper opening each include an axis and a plane through each opening which is substantially normal to the associated opening axis, said axes being substantially coaxially aligned in said blower housing and hopper first sweeping positions, and said opening planes set off one of an upwardly opening and a downwardly opening acute angle when said blower housing is in one of the second dumping and the third servicing positions thereof.
13. The sweeper as defined in claim 1 wherein said blower housing supporting means support said blower housing for movement between the first sweeping position thereof and a third position adapted for servicing blower components carried by said blower housing, said blower housing opening and hopper opening each include an axis and a plane through each opening which is substantially normal to the associated opening axis, said axes being substantially coaxially aligned in said blower housing and hopper first sweeping positions, and said planes set off an upwardly opening acute angle when said blower housing is in the second dumping position thereof.
14. The sweeper as defined in claim 1 wherein said blower housing supporting means support said blower housing for movement between the first sweeping position thereof and a third position adapted for servicing blower components carried by said blower housing, said blower housing opening and hopper opening each include an axis and a plane through each opening which is substantially normal to the associated opening axis, said axes being substantially coaxially aligned in said blower housing and hopper first sweeping positions, and said opening planes set off a downwardly opening acute angle wherein said blower housing is in the third servicing position thereof.
15. The sweeper as defined in claim 1 wherein said blower housing supporting means support said blower housing for movement between the first sweeping position thereof and a third position adapted for servicing blower components carried by said blower housing, said blower housing opening and hopper opening each include an axis and a plane through each opening which is substantially normal to the associated opening axis, said axes being substantially coaxially aligned in said blower housing and hopper first sweeping positions, said planes set off an upwardly opening acute angle when said blower housing is in the second dumping position thereof, said opening planes set off a downwardly opening acute angle wherein said blower housing is in the third servicing position thereof.
16. The sweeper as defined in claim 1 wherein said blower housing moving means is defined by mechanical spring biasing means for biasingly urging said blower housing from the first sweeping position toward the second dumping position thereof, and means for loading said spring biasing means during movement of said hopper from the second dumping position toward the first sweeping position thereof.
17. The sweeper as defined in claim 1 wherein said vehicle includes a frame, and said distance increasing means includes pivot means of said blower housing supporting means between said frame and blower housing about which said blower housing pivots during movement thereof from said blower housing first position toward said blower housing second position.
18. The sweeper as defined in claim 1 wherein said vehicle includes a frame, and said distance increasing means includes pivot means of said blower housing supporting means between said frame and blower housing about which said blower housing pivots during movement thereof from said blower housing first position toward said blower housing second position, and said blower housing moving means is defined by biasing means disposed between said blower housing and said frame.
19. The sweeper as defined in claim 1 wherein said vehicle includes a frame, and said distance increasing means includes pivot means of said blower housing supporting means between said frame and blower housing about which said blower housing pivots during movement thereof from said blower housing first position toward said blower housing second position, said blower housing moving means is defined by biasing means disposed between said blower housing and said frame, and first and second pivot means for pivotally connecting said biasing means respectively to said frame and to said blower housing.
20. The sweeper as defined in claim 1 wherein said substantially horizontal axis comprises at least one axial bolt coaxially aligned along said substantially horizontal axis.
21. A sweeper comprising a vehicle, a blower housing and a hopper carried by said vehicle, means for supporting said hopper for movement between a first sweeping position and a second dumping position, means for supporting said blower housing for movement between a first sweeping position and a second repair position, means for moving said hopper from the first position toward the second position thereof, means for effecting rotational movement of said blower housing about a substantially horizontal axis from the first sweeping position toward the second repair position thereof, an opening in said blower housing and an opening in said hopper through which media flows when said blower housing and hopper are each in the first position thereof, said openings each having an axis which are coaxially aligned in said first positions, a sealing plane of said openings in said first positions being substantially normal to said aligned axes in said first positions, said blower opening axis in said blower housing second repair position defining a downwardly opening acute angle relative to the sealing plane of said openings in said first positions.
22. The sweeper as defined in claim 21 including means for imparting a biasing force to said blower housing for moving said blower housing to a third dumping position, and means for at least reducing said biasing force to effect ease of movement of said blower housing from said first sweeping position to said second repair position.
23. The sweeper as defined in claim 22 wherein said biasing force effecting means includes at least one compression spring, and said biasing force reducing means is effecting to lengthen said at least one compression spring.
24. The sweeper as defined in claim 21 wherein said substantially horizontal axis comprises at least one axial bolt coaxially aligned along said substantially horizontal axis.
3512206 | May 1970 | Young |
3545181 | December 1970 | Young |
3634904 | January 1972 | Larson |
3959846 | June 1, 1976 | Yasuda |
4227893 | October 14, 1980 | Shaddock |
4885817 | December 12, 1989 | Tanase |
5072485 | December 17, 1991 | Young |
5218737 | June 15, 1993 | Dansby et al. |
5596788 | January 28, 1997 | Linville et al. |
20040045111 | March 11, 2004 | Engel et al. |
10118500 | August 2002 | DE |
1203888 | September 1970 | GB |
- German Patent Application No. 10 2006 036 016.8-25—First Office Action mailed Jan. 16, 2009.
- Canadian Patent Application No. 2,555,123—Canadian Patent Office Examination Report mailed by CIPO (Canadian Intellectual Property Office) on Sep. 16, 2009.
Type: Grant
Filed: Aug 8, 2005
Date of Patent: Nov 22, 2011
Patent Publication Number: 20070028414
Assignee: TYMCO, Inc. (Waco, TX)
Inventors: Gary B. Young (Waco, TX), James C. Crow (Waco, TX)
Primary Examiner: David Redding
Attorney: Miles & Stockbridge P.C.
Application Number: 11/198,358
International Classification: E01H 1/08 (20060101);